I disagree with your assessment. Florida State is the party driving all the instability in the ACC right now. The B1G pushed over the first domino, but FSU is the next one in line. They, and by they I mean Jimbo Fisher, believe their conference affiliation is holding their football program back from competing for national championships. Clemson will go where Florida State goes.
FSU would join the SEC tomorrow if it could, but there's no way that happens. UF, UGA, and USC want no part of FSU or Clemson. Adding those teams adds zero value to the SEC Network, because they overlap with existing SEC markets. The B1G is not interested in FSU or Clemson because they regard AAU membership as part of their DNA. That leaves the Big 12. If the ACC falls apart, the Big 12 makes the next move and takes FSU and Clemson. Texas will try to stop it, and the other nine schools will tell them to go themselves.
B1G wants Notre Dame. In fact, that's why they started in with Maryland when they became aware of their financial problems. If ND wants to snub the B1G to affiliate with the ACC, then Jim Delany is more than happy to rip apart the ACC. B1G is already talking to Virginia. If they can't convince ND to back out of their ACC deal and join the B1G, then they'll take Georgia Tech.
The SEC would look towards Virginia Tech and NCSU because it expands their reach into two new states.
UNC would be a huge plum for any conference that could get them, but UNC is committed to the ACC because they have the same power there that Texas has enjoyed over the Big 12. And much as they would love to go big-time in football, they aren't willing to give up that power or their basketball program to get it. Nor are they willing to separate from Duke. They're more likely to preside over the formation of a basketball superconference from the rumps of the ACC and heritage-Big East than they are to peel away to some other conference. For the time being whatever is left of the ACC still would enjoy a BCS automatic bid.
Right now FSU is waiting to see what happens with the Maryland buyout. The ACC filed a suit trying to make sure UMd pays the $52 million in full. If that gets reduced significantly in court, FSU bolts to the Big 12 ASAP and takes Clemson with them. DeLoss Dodds might not like it, but the rest of the conference will tell him to blow it out his ass. He's lost a fair amount of power now that it's clear how much damage he's done to the Big 12 in driving off 1/3 of the old members, and will be retiring soon.
One other caveat that might forestall this is that Jimbo Fisher may just take one of the open SEC coaching jobs. That would slow the momentum to destroy the ACC for the time being.